OPINION OF THE COURT

Patricia Dowling was arrested by Philadelphia police officers and charged with defiant trespass and criminal conspiracy while she was protesting outside of an abortion clinic in Northeast Philadelphia. After the Philadelphia Municipal Court sustained a demurrer to the criminal charges. Dowling brought a civil rights action against the abortion clinic, its parent company, and the City of Philadelphia, alleging that her arrest and detention violated her constitutional rights and constituted the basis of state law torts as well. The district court gave summary judgment for the defendants. This appeal followed.

I.

Background

Dowling filed her civil rights complaint on November 5, 1986 in the Court of Common Pleas against the City of Philadelphia; the Northeast Women’s Center, Inc. (NEWC), outside of which Dowling was arrested; and Humedco Corporation, NEWC’s parent corporation. The action was removed to federal court.

NEWC and Humedco answered Dowl-ing’s amended complaint and asserted both a counterclaim against Dowling and a third-party claim against the Pro-Life Coalition of Southeastern Pennsylvania for trespass and intentional interference with business relations.^[1] On April 1, 1987, the City filed a motion for a protective order from certain discovery Dowling sought, together with affidavits of its employees. On the same day, the City filed a motion for summary judgment, relying on Dowl-ing’s deposition and a partial transcript of the criminal proceeding containing the testimony of one of the arresting officers. Dowling responded without filing any affidavits. The district court entered an order on November 25, 1987 granting summary judgment to the City, NEWC and Humed-co.

On December 11, 1987, the Pro-Life Coalition filed a motion for summary judgment on NEWC’s and Humedco’s third-party claim. On December 17, 1987, Dowling filed her notice of appeal from the district court’s November 25, 1987 order. Five[*138] days thereafter, on December 22, 1987, the district court entered an order granting the Pro-Life Coalition’s motion for summary judgment on the third-party claim. Finally, on December 23, 1987 the district court dismissed the remaining claim, NEWC’s and Humedco’s counterclaim against Dowl-ing.

II.

Jurisdiction

We consider initially whether we are deprived of jurisdiction because Dowling’s appeal was taken from the order granting defendants summary judgment although the counterclaim of two defendants and their third-party claim were still outstanding. The order granting summary judgment was not final because it did not dispose of all the claims between the original parties. Even had the order done so, and hence been final in the traditional sense of finality, the concept embodied in Fed.R.Civ.P. 54(b) of an action as a single judicial unit would have precluded appeal until all other outstanding claims were determined. See Shirey v. Bensalem Township, 663 F.2d 472, 474-75 (3d Cir.1981).

However, within a week from the filing of Dowling’s notice of appeal, all outstanding claims were disposed of. In Griggs v. Provident Consumer Discount Co., 459 U.S. 56, 61, 103 S.Ct. 400, 403, 74 L.Ed.2d 225 (1982) (per curiam), the Court held that a notice of appeal filed prior to the disposition of a post-trial motion made pursuant to Fed.R.Civ.P. 59 is a “nullity.” We have interpreted the Supreme Court’s decision as affecting only those cases involving the post-trial motions specifically enumerated in Fed.R.App.P. 4(a)(4), i.e., motions under Fed.R.Civ.P. 50(b), 52(b), and 59. See Cape May Greene, Inc. v. Warren, 698 F.2d 179, 185 (3d Cir.1983). Thus, this case does not present a Griggs situation.

This court has held that “a premature appeal taken from an order which is not final but which is followed by an order that is final may be regarded as an appeal from the final order in the absence of a showing of prejudice to the other party.” Richerson v. Jones, 551 F.2d 918, 922 (3d Cir.1977) (emphasis in original). We have followed that practice even after Griggs. See Cape May Greene, 698 F.2d at 185; see also Presinzano v. Hoffman-La Roche, Inc., 726 F.2d 105 (3d Cir.1984) (holding, as one of two alternate bases for jurisdiction, that a subsequent ruling on plaintiff’s claim under section 504 of the Rehabilitation Act, 29 U.S.C. § 794, cured a premature notice of appeal taken from the court’s entry of summary judgment under section 503 of the Rehabilitation Act, 29 U.S.C. § 793); Knight v. Brown Transport Corp., 806 F.2d 479, 483-84 (3d Cir.1986) (district court’s dismissal of last remaining claim, a loss of consortium claim asserted against defendant by plaintiff’s wife, cured premature notice of appeal).

Our precedent directs us to inquire whether there will be any prejudice to the appellees if we take jurisdiction from a premature notice of appeal. See Richerson v. Jones, 551 F.2d at 923. In this case the dangling claims were disposed of by the district court within a week of Dowling’s notice of appeal. We see no possibility of any prejudice. Under these circumstances and pursuant to our precedent, we conclude that we may take jurisdiction notwithstanding that the notice of appeal was from an order that did not become appealable until shortly after the filing of the notice of appeal.^[2]

III.

Discovery

We turn next to Dowling’s argument that the district court abused its discretion by granting summary judgment to defendants before she had an adequate op-[*139]portunity to obtain discovery and while the motion for a protective order was outstanding. To properly assess this contention we must consider the procedural history in some detail.

Dowling’s complaint alleges that defendants “knew that they were without probable cause to arrest her,” App. at 130, thereby depriving Dowling of her Fifth and Fourteenth Amendment due process and equal protection rights in violation of 42 U.S.C. § 1983 (1982). The complaint further alleges that Dowling’s arrest and detention were part of a conspiracy motivated by anti-Catholic animus between the Philadelphia police, the District Attorney’s office, NEWC and Humedco to deprive her of her constitutional rights, and that defendants’ actions constituted the state law torts of malicious prosecution, false arrest, and false imprisonment.

The district court held a pretrial conference on February 24, 1987 and entered an order on March 2, 1987 which, inter alia, set May 1, 1987 as the date for completion of discovery. Defendants took Dowling’s deposition on March 11,1987, and on March 20, 1987 Dowling served defendants with a notice of depositions of eleven City employees and one employee of the corporate defendants. The City employees notice for deposition included the arresting officers, the Police Commissioner, two former Police Commissioners, the Deputy City Solicitor, and a former Deputy City Solicitor.

The City did not produce its employees for deposition. Instead, on April 1, 1987 it filed both a motion for a protective order and a motion for summary judgment. The motion for a protective order, filed on the grounds that the depositions scheduled were overbroad, oppressive and burdensome, sought a stay of Dowling’s discovery “save for facts relevant to her response to Defendant’s Motion for Summary Judgment.” App. at 101.

Dowling stated in her answer to the City’s motion for a protective order that she “must use some evidence obtained from defendants in the cours[e] of discovery to meet her burden” as part of her case in chief. App. at 124. Specifically, she stated that she needed to depose the present and former police commissioners “because Police Commissioner Tucker advised various members of the Pro-Life movement that he was merely continuing the policy of his predecessors in authorizing arrests that were similar to the plaintiff’s arrest,” and the present and former city solicitors because “there have been numerous references to directives from the City Solicitor to the police regarding the arrest policy of pro-life people.” App. at 124. Dowling also explained that “[t]he very short period of time for discovery in this case necessitated the use of depositions rather than written interrogatories.” App. at 125.

The district court entered summary judgment for defendants on November 25, 1987, without ever having ruled on the City’s motion for a protective order. Dowl-ing now complains that she was deprived an opportunity for discovery and contends that the district court abused its discretion by entering summary judgment for defendants without first ruling on the protective order motion.

The court is obliged to give a party opposing summary judgment an adequate opportunity to obtain discovery. See Celotex Corp. v. Catrett, 477 U.S. 317, 322, 106 S.Ct. 2548, 2552, 91 L.Ed.2d 265 (1986); see also Costlow v. United States, 552 F.2d 560, 563-64 (3d Cir.1977). If, however, a party opposing a summary judgment motion believes that s/he needs additional time for discovery, Rule 56(f) of the Federal Rules of Civil Procedure specifies the procedure to be followed. Rule 56(f) provides:

Should it appear from the affidavits of' a party opposing the motion that the party cannot for reasons stated present by affidavit facts essential to justify the party’s opposition, the court may refuse the application for judgment or may order a continuance to permit affidavits to be obtained or depositions to be taken or discovery to be had or may make such other order as is just.

This court has interpreted Rule 56(f) as imposing a requirement that a party seek[*140]ing further discovery in response to a summary judgment motion submit an affidavit specifying, for example, what particular information is sought; how, if uncovered, it would preclude summary judgment; and why it has not previously been obtained. See Hancock Industries v. Schaeffer, 811 F.2d 225, 229-30 (3d Cir.1987) (Rule 56(f) motion, even if treated as an affidavit, insufficient because it failed to explain need for discovery and did not identify particular facts hoped to be uncovered); Koplove v. Ford Motor Co., 795 F.2d 15, 18 (3d Cir.1986) (Rule 56(f) affidavit insufficient because it did not specify what discovery was needed or why it had not previously been secured).

Moreover, “[mjost courts which have considered the issue agree that filing an affidavit is necessary for the preservation of a Rule 56(f) contention that summary judgment should be delayed pending further discovery.” Mid-South Grizzlies v. National Football League, 720 F.2d 772, 780 n. 4 (3d Cir.1983) (citing cases), cert. denied, 467 U.S. 1215, 104 S.Ct. 2657, 81 L.Ed.2d 364 (1984); see Falcone v. Columbia Pictures Industries, 805 F.2d 115, 117 n. 2 (3d Cir.1986); Gray v. Udevitz, 656 F.2d 588, 592 (10th Cir.1981); cf. Robin Construction Co. v. United States, 345 F.2d 610, 614 (3d Cir.1965) (to take advantage of Rule 56(f) party “must state by affidavit the reasons for his inability” to obtain discovery).

Dowling did not file a Rule 56(f) affidavit with her response to the City’s motion for summary judgment, and therefore, as a procedural matter alone, she has failed to comply with the rule. Even if we were to treat Dowling’s answer to the City’s motion for a protective order as a Rule 56(f) affidavit, it would be insufficient because the fact Dowling stated she hoped to uncover would not have precluded summary judgment. See Hancock, 811 F.2d at 230.

It obviously would have been preferable for the district court to have acted on the outstanding motion for a protective order before ruling on the summary judgment motion. However, the outstanding motion for a protective order did not alter Dowl-ing’s obligation under the federal rules to file a Rule 56(f) affidavit if she believed the outstanding discovery was necessary to her response.

Moreover, there is no basis for Dowling’s claim that the mere existence of the City’s motion for a protective order deprived her of “the opportunity to obtain any discovery from any original defendant in this case.” Dowling’s Brief at 15. By its very terms, the City’s motion sought only to prevent Dowling from deposing eleven City employees on facts not “relevant to her response to [the City’s] Motion for Summary Judgment,” App. at 101, and thus explicitly left her free to seek any discovery necessary for her response to the summary judgment motion.

Moreover, the protective order motion did not prohibit Dowling from deposing the employees of either of the corporate defendants, nor from pursuing alternative avenues of discovery from any of the defendants, including the City. It did not prevent her from filing interrogatories or from seeking an extension of the court’s May 1, 1987 discovery deadline. Had Dowling believed that the depositions she sought were essential to her case, she could have somehow brought that fact to the attention of the district court by, for example, filing a motion to compel.

Most important, there was absolutely nothing to prevent Dowling from filing her own affidavit and that of other protestors if she had any information that would have created a material issue of fact on a relevant issue. For some inexplicable reason, Dowling chose not to pursue any of these paths and instead did absolutely nothing to obtain discovery from any of the defendants in the approximately seven months that elapsed between the time Dowling filed her answer to the City’s motions and the court granted the City’s summary judgment motion.^[3]

[*141] In view of the limits of the terms of the protective order motion, of Dowling’s failure to pursue available discovery avenues, and of her failure to comply with Rule 56(f), we conclude that the district court acted within the permissible bounds of its discretion when it ruled on the City’s summary judgment motion on the record before it.

IV.

Summary Judgment

Our review of the district court’s grant of summary judgment for defendants is plenary; that is, we must determine whether there existed any genuine issue of material fact that would permit a reasonable jury to find for Dowling. See Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 247-48, 106 S.Ct. 2505, 2509-10, 91 L.Ed.2d 202 (1986).

The district court’s grant of summary judgment was based on its conclusion, after reviewing the materials submitted by the City in support of its motion for summary judgment, that the police had probable cause to arrest Dowling and, therefore, there was no section 1983, section 1985, or state law violation. The parties agree that the existence of probable cause is the threshold issue. The proper inquiry in a section 1983 claim based on false arrest or misuse of the criminal process is not whether the person arrested in fact committed the offense but whether the arresting officers had probable cause to believe the person arrested had committed the offense. See Bodzin v. City of Dallas, 768 F.2d 722, 724 (5th Cir.1985); Losch v. Borough of Parkesburg, 736 F.2d 903, 907-08 (3d Cir.1984); Patzig v. O’Neil, 511 F.2d 841, 848 (3d Cir.1978).

The offense of defiant trespass covers any person who, with knowledge that she is not licensed or privileged to do so, enters or remains in any place as to which notice against trespass has been given.^[4] The criminal conspiracy statute prohibits an agreement between persons either to commit or to aid in the commission of a crime with the intent of promoting or facilitating the commission of the crime.^[5]

The partial transcript of the municipal court criminal proceeding against Dowling on the trespass and conspiracy charges, which the City submitted in support of its motion for summary judgment, included-the testimony of Officer Oliverio, one of the officers who arrested Dowling. Oliver-io testified that when he arrived on the scene on the morning of Dowling’s arrest he showed Dowling and the other protesters where he believed the property line was, and told them that if they crossed it by moving from the public sidewalk onto the grassy area in front of the building[*142] they would be arrested.^[6] Oliverio also testified that he saw Dowling and others cross that property line in order to hand out leaflets to persons entering the building in which the NEWC clinic was housed, despite his repeated warnings that they not do so.

In addition, Dowling stated in her deposition, which the City also submitted, that the police officers warned her when she arrived at the scene on the morning of her arrest that she might be arrested. Although Dowling chose to characterize the police officer’s warning as “kidding”, App. at 61, she also testified that she witnessed the arrest of at least one other protester who ventured onto the grassy area that the police had warned the protesters not to cross, that she knew that protester was arrested “[b]ecause they didn’t want her on the property there,” App. at 56, and that she believed that there was “some type of an injunction” in connection with the property in front of the NEWC clinic. App. at 65. Moreover, Dowling admitted that she herself crossed onto the grassy area to attempt to persuade her fellow protester to move and that she remained on the grass to pass out the Pro-Life Coalition’s literature. App. at 56, 57, 59.

In view of this evidence,^[7] we conclude that the City amply established that the officers had probable cause to arrest Dowl-ing.^[8]

Dowling, in contrast, has utterly “fail[ed] to make a showing sufficient to establish the existence of an element essential to [her] case, and on which [she] will bear the burden of proof at trial.” Celotex Corp. v. Catrett, 477 U.S. 317, 322, 106 S.Ct. 2548, 2553, 91 L.Ed.2d 265 (1986). It was incumbent upon Dowling to produce evidence to support her allegation, on which she bore the burden of proof, that her arrest was not premised upon the officers’ reasonable belief that she had violated the law, but, rather, was part of a policy and conspiracy to violate her constitutional rights. Specifically, Rule 56(e) of the Federal Rules of Civil Procedure requires that “[w]hen a motion for summary judgment is made and supported as provided in this rule, an adverse party may not rest upon the mere allegations or denials of the adverse party’s pleadings, but the adverse party’s re[*143]sponse, by affidavits or as otherwise provided in this rule, must set forth specific facts showing that there is a genuine issue for trial.” See Celotex, 477 U.S. at 324, 106 S.Ct. at 2553; Tilden Financial Corp. v. Palo Tire Serv., 596 F.2d 604, 607-08 (3d Cir.1979); Robin Construction Co. v. United States, 345 F.2d 610, 613-14 (3d Cir.1965).

Dowling responded to the City’s summary judgment motion merely with a brief answer and five-page memorandum denying the City’s contentions and reiterating the allegations of her complaint. She failed to include either any affidavits or any other supporting materials. In this regard, our opinion in Losch v. Borough of Parkesburg, 736 F.2d 903 (3d Cir.1984), on which Dowling relies, actually supports defendants’ position in this case. In Losch, a case in which plaintiff filed a civil rights action based on defendants’ initiation of a criminal prosecution against him, the issue was whether there was a genuine issue of material fact as to whether the police had probable cause to institute the criminal proceedings. We reversed the district court’s grant of summary judgment to defendants on the ground that the affidavits submitted by plaintiff in response to defendants’ summary judgment motion raised a credibility issue that should not have been decided on summary judgment. Id. at 908-09. In contrast, in this case, where the City’s supporting materials established that the police had probable cause to arrest Dowling, and Dowling put forth no evidence to the contrary, there is no genuine issue of material fact for trial. See Peterson v. United States, 694 F.2d 943, 946 (3d Cir.1982); Fireman’s Insurance Co. v. DuFresne, 676 F.2d 965, 969 (3d Cir.1982).

V.

Conclusion

Nothing in this opinion derogates from the right of Dowling and others to exercise their First Amendment rights. However, the police have an obligation to take reasonable steps to attempt to insure that protestors do not cross the line between peaceful protest and violation of the law. Because Dowling has not made any showing that the defendants acted beyond this permissible objective and for the reasons set forth above, we will affirm the order of the district court.